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A method to construct the fracture locus in the range of high stress triaxiality when only a round tensile specimen is available

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Abstract

Our aim was to develop a method to construct a fracture locus for tensile loading with large positive values of stress triaxiality with only a round tensile specimen. Previously, at least three repetitions of tensile tests using a round tensile specimen, circumferentially notched tensile specimen and circumferentially cracked tensile specimen were required when we constructed the fracture locus. A fundamental idea considered in this study is to modify the Hancock and Mackenzie model by relating void nucleation strain to strain at necking and replacing the parameter in the model with a material constant depending on strain hardening coefficient. Validity of the proposed method was verified by comparing fracture loci constructed using the proposed method with data set measured by earlier researchers. Fracture loci constructed by the proposed method are in agreement with data set for ductile steels with yield stress in the range of 200-500 MPa and uniform strain of material is higher than 0.1.

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Authors and Affiliations

  1. Gas Facility Technology Center, KOGAS Research Institute, Ansan, Gyeonggi-do, 15328, Korea

    Yun-Chan Jang

  2. Department of Mechanical Engineering, Chung-Ang University, Seoul, 06974, Korea

    Youngseog Lee

Authors
  1. Yun-Chan Jang
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  2. Youngseog Lee
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Correspondence to Youngseog Lee.

Additional information

Recommended by Associate Editor Hak-Sung Kim

Yun-Chan Jang received the B.S., M.S. and Ph.D. in Mechanical Engineering from Chung-Ang University, Seoul, Korea, in 2007, 2009 and 2015, respectively. Until 2018, he worked as a researcher at Nuclear Analysis Team of Doosan Heavy Industries, Korea. He is currently working at KOGAS Research Institute, Korea. He is interested in damage model, fracture locus and numerical analysis of crack propagation.

Youngseog Lee received the B.S. in Mechanical Engineering from Pusan National University, Korea, in 1989. He then received the M.S. and Ph.D. from Case Western Reserve University, Cleveland, Ohio, USA, in 1992 and 1997, respectively. Until 2003, he worked as a researcher at POSCO Technical Research Laboratories, Pohang, Korea. He is currently a Professor in the Department of Mechanical Engineering, Chung-Ang University, Seoul, Korea. He is interested in the area of ductile fracture locus at high strain rate of steels and its applications to hypervelocity penetration.

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Jang, YC., Lee, Y. A method to construct the fracture locus in the range of high stress triaxiality when only a round tensile specimen is available. J Mech Sci Technol 33, 1195–1201 (2019). https://doi.org/10.1007/s12206-019-0219-z

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  • DOI: https://doi.org/10.1007/s12206-019-0219-z

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